Close #1998.

(cherry picked from commit d2348d98)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

This Widget (base QLabel) is designed to show the cover art. It handles right-click, and show a context menu that has only one entry:

- Download cover art

When the user clicks it, vlc downloads the cover art (or finds it in the cache), and displays it when downloaded
(cherry picked from commit 4dd472bb)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

(cherry picked from commit d8c32a08)

(cherry picked from commit fccf6aa0)

And Fixed initial snpshot/fullscreen state.
It fixes a regression introduced by fccf6aa0

It is provided for convenience for interfaces.

(cherry picked from commit dbc2bb8a)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

(cherry picked from commit 8cebd56a)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

(it was used by net_OpenDgram when no server is specified).

This reverts commit 1a4dc822.
I will backport the proper fix.

It may improve TS clock synchro algo.

DEMUX_GET_PTS_DELAY should returns microsecond.

You should NOT remove caching to PTS to create PCR.
It was probably a workaround for the previous bug. It could explains
the problems with TS over RTP (for TS with small pcr/pts delay that is, not
created by VLC)

Implemented missing DEMUX_CAN_* query.

(cherry picked from commit 2221f03d)

(cherry picked from commit b8b83532)

Pointed-out-by: Sébastien Escudier
(cherry picked from commit b4329926)

Crash happens if you do:
 - Play item
 - Activate vfilter
 - Stop item
 - Deactivate vfilter... BooM.

This is a quick fix that does not want to be in master... Proper fix should go to master.

 While it is great for (some) streaming cases it is really wrong for saving
to a file for example and/or without using the gather module.

 If you have read how to use the gather module, you probably have read enough
documentation to add sout-keep...

This is of course NOT a good solution, and it has nothing to do in the interface...
So, either we let it like this, or we implement in the good place (not in intf)
or we remove this option

(cherry picked from commit ed98d997)

(cherry picked from commit 2b112bad)

Already available in the interface sprefs.
This reverts commit 1abb581f.

(cherry picked from commit c1a144df)

(cherry picked from commit 446be1c2)

(cherry picked from commit b7e41633)

(cherry picked from commit 9a5e5236)

(cherry picked from commit d6c0f242)

The only user is LUA, inlined there. The return value seems suspicious
by the way.
(cherry picked from commit 1014a2aa)

(cherry picked from commit be0af925)

(cherry picked from commit 475d7593)

(cherry picked from commit daf44288)

(cherry picked from commit b3bf199a)